Author

The author of Jet Set Willy wrote the game and its predecessor Manic Miner before he was 18.

Copy protection

As ZX Spectrum games were distributed on audio cassettes, piracy was a major concern. Jet Set Willy was the first game in the world to feature copy protection, in the shape of codes (printed on a coloured card) which had to be typed in after loading the game.

Game patches

The original release of Jet Set Willy was buggy - entering The Attic led to memory corruption, and the game would crash if the player subsequently entered The Kitchen! Initially, the publisher claimed that this was a feature, but later released a fix, making Jet Set Willy one of the first commercial games to have a patch produced.

Mods

Approximately a year after Jet Set Willy was released, the computer magazine Your Spectrum published a type-in which added an extra room to the game. This was perhaps the first third-party mod ever released for a commercial game.

Music

The music playing in the background is If I were a Rich Man from the US Broadway musical Fiddler on the Roof, first performed in 1964.

Ports

Circa 1989, Paul Taylor and Carl Whitwell worked on an Atari ST conversion of this game for Software Projects -- late enough in the title's life that the painstaking port (disassembled code read off the Spectrum's monitor and typed into the Atari's keyboard, screen data dumped as hex and dictated to a typist) was never released to the commercial market. During the same period Shahid Ahmad worked on an Amiga port that met a similar fate of obscurity.

Awards

ACE (Advanced Computer Entertainment)

February 1991 (issue #41) - Included in the list Greatest Games of all Time, section Platform-based Games (editorial staff choice)